The BT1517 Rail Mounting Fastener Set is used for mounting rails and consists of two (2) 10-32 T-Nuts and two (2) 10-32 x ¾” Button Head Cap Screws. Sold as a pair.
These T-nuts are commonly used by stock builders to accommodate the installation of sling studs and rails. They are typically bedded into the stock from the barrel channel side as illustrated in the third image.
Weight: 0.4 ounces
Neither B&T Industries L.L.C. nor JJ Gun Supply make any recommendations or suggestions regarding stock alterations. ALL such modifications should be done by a competent gunsmith. Purchase of these parts will be considered an acknowledgment of this.
If you have the necessary skillset and tools, feel free to check out this method of How to Install a Rail
https://accu-shot.com/bt-industries-l-l-c-tutorials/how-to-install-a-rail/